Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e3bd457fbf6d87…

MALICIOUS

PDF

74.7 KB Created: 2021-06-01 09:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b744bc6cf573d5ec7c5f4dcd67726f36 SHA-1: fbbaf666726c78b59bd9d3d3295e4bbd367b3495 SHA-256: 71e3bd457fbf6d87d3553fa2f17a515ad868947fd962f935d2fbd9c133351acc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL, https://queure.ru/pbw?utm_term=what+to+do+when+keyboard+letters+don%2527t+work, suggests a phishing or malware distribution lure, disguised as a help page for keyboard problems. The PDF structure also contains numerous links to external resources, some of which are hosted on disposable domains, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/pbw?utm_term=what+to+do+when+keyboard+letters+don%2527t+work
    • https://cdn-cms.f-static.net/uploads/4459939/normal_6031f91a7bb13.pdf
    • https://cdn-cms.f-static.net/uploads/4369336/normal_6063a5d786be1.pdf
    • https://cdn-cms.f-static.net/uploads/4385434/normal_604a41072785d.pdf
    • https://xorexataziz.weebly.com/uploads/1/3/4/4/134496469/94d082d.pdf
    • https://tizomejina.weebly.com/uploads/1/3/3/9/133997236/e9790c7.pdf
    • https://static.s123-cdn-static-d.com/uploads/4365552/normal_60b5a23a06538.pdf
    • https://duxojavuse.weebly.com/uploads/1/3/1/4/131483254/geforemumamip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sinorodolu.pbworks.com/f/49693587063.pdf
    • https://uploads.strikinglycdn.com/files/11d18a95-1d7a-4849-92f1-a9ae7b6de95a/18925680053.pdf
    • http://pamotekegopa.pbworks.com/f/cdigos_para_tener_diamantes_gratis_en_free_fire.pdf
    • https://uploads.strikinglycdn.com/files/246c35c5-7c37-49c4-a736-217814c95151/55572288481.pdf
    • https://uploads.strikinglycdn.com/files/954e4f43-dc7b-4156-8194-d6ba75d1abef/how_long_does_it_take_to_write_a_screenplay.pdf
    • http://lekuzax.pbworks.com/w/file/fetch/144419187/do_blue_dye_tests_always_have_a_faint_line.pdf
    • http://nefusim.pbworks.com/f/dresser_son_chien_gratuit.pdf
    • http://niwomif.pbworks.com/f/jfk_inaugural_address_analysis_ethos_pathos_logos.pdf
    • http://tukufidanega.pbworks.com/w/file/fetch/144422487/virus_and_bacteria_coloring_worksheet.pdf
    • http://rugewenuzed.pbworks.com/w/file/fetch/144423462/buvirixu.pdf
    • http://wuxikadafi.pbworks.com/w/file/fetch/144414201/resignation_letter_format_in_marathi.pdf
    • http://sepaxebi.pbworks.com/f/tibixusowodususevunagor.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e675.bin
5794ff9a69398f940d0bf57dbd6935ab99157e893e12ea68facbfc913cc51394		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 5356 bytes
font_01_sfnt_off0000f8c3.bin
1100eac47d03f2913d1629f3ddccf7d4176dec4246d181ab17137de95b2b71a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 11436 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.